Dodgy coil?

[mgcjag]

Ok so just called Powerspark....looks like the info on their site re their HT leads is incorrect.....they list both carbon and copper with Silicone insulation.....this is incorrect (spoke to their technical)....the copper does not have silicone insulation.......the reccomendation for silicone/carbon is based on the leads being suppressed....the king lead(coil to cap) being the most important.....quite a lot of us will already have suppression in each of the spark plugs...but if useing copper leads no suppression in the king lead.....useing carbon suppressed leads will ensure that the king lead is also suppressed
Note error on the site https://simonbbc.com/about-powerspark-8 ... -ht-leads/
Also note that not all silicone leads have carbon core some have copper

[MikeMilton]

FWIW (likely not much) 123ignition make specific coil recommendations.
http://www.123ignition.nl/page.phtml?id=19# see the entry under technical questions.

It will be a (long) while, but my car will be fitted with the BT version of the 123 ignition + bosch red coil and I will eventually report back here.

it is likely a bad idea to economize by using a pre-existing coil.